M.Sc. DEGREE EXAMINATION, APRIL/MAY 2018.
Second Semester
Physics
CONDENSED MATTER PHYSICS
2 20723 A
Time 3 Hours Max. Marks 70
SECTION — A
Answer any FIVE of the following. 6 30 Marks)
1. Write a note on Bravais lattices.
2. Explain the concept of quantization of lattice vibrational energy.
3. Obtain Boltzmann transport equation.
4. Write a note on direct and indirect band gap semiconductors.
5. Explain dissociation energy.
6. Explain the formation of colour centers.
7. State and explain Meissner effect.
8. Write down the applications of superconductors.
SECTION — B
Answer ALL questions. 10 40 Marks)
9. Explain lattice vibrations in mono atomic one dimensional infinitely long
lattices.
Or
Explain the vibrational spectra of finite lattice and define phonons.
10. Explain Bloch functions and briefly explain the Kronig-Penny model.
Or
Obtain an expression for position of Fermi levels and carrier concentration in
intrinsic semiconductors.

11. Describe with suitable diagram Schottky and Frenkel defects in crystals.
Or
Explain the surface imperfections in crystals.
12. Explain the concept of zero resistance and discuss the magnetic behavior of
perfect conductor.
Or
Obtain London equations and explain it importance.
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